Maggol, MG 350: Llanvirn, South Korea
collected by C.-S. Yun, K. Tanabe 1997
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Cephalopoda
- Endocerida
- Endoceratidae
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Kotoceras grabaui
(Kobayashi 1927)
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| see common names | |||||||
Geography
| Country: | South Korea | State/province: | Kangweondo (Gangwon-do) | County: | Yeongwol |
| Coordinates: | 37.2° North, 128.7° East (view map) | ||||
| Paleocoordinates: | 5.8° South, 132.4° East | ||||
| Basis of coordinate: | estimated from map | ||||
| Geographic resolution: | small collection |
Time
| Period: | Ordovician | Epoch: | Middle Ordovician |
| 10 m.y. bin: | Ordovician 2-3 | ||
| Key time interval: | Llanvirn | ||
| Age range of interval: | 468.40000 - 458.40000 m.y. ago |
Stratigraphy
| Geological group: | Taebaek | Formation: | Jigunsan | ||
| Local section: | Maggol (MG) | Local bed: | 350 | ||
| Local order: | bottom to top | ||||
| Stratigraphic resolution: | bed | ||||
| Stratigraphy comments: Bed 350 is in the "Middle Member" of the Jigunsan Fm. according to fig. 2 in Yun (1999). The Jigunsan Formation (formerly spelled Chikunsan or Chigunsan Formation) is a subunit of the Taebaek Group and is Llanvirnian in age (see Kwon, 2005, Geosci. J. 9(4)). | |||||
Lithology and environment
| Primary lithology: | bioturbation "shale" | ||
| Includes fossils? | Y | ||
| Lithology description: "The Jigunsan Formation is a relatively thin (45-100 m in thickness) fossiliferous sequence of interbedded shale and subordinate limestone." (Niko, 2000, Paleont. Res. 6(1)). The lithology of bed 350 is "vermicular shale" according to stratigraphic log in fig. 2 in Yun (1999) which is interpreted here as bioturbated shale. | |||
| Environment: | open shallow subtidal | Tectonic setting: | cratonic basin |
| Glacial or sequence phase: | highstand systems tract | ||
| Geology comments: These deposits appear to match facies association 5 ("highly bioturbated") of Woo & Chough (2007, Geosci. J. 11(4)), interpreted to represent a shallow subtidal ramp environment within a highstand systems tract. | |||
Taphonomy
| Size of fossils: | macrofossils |
| Temporal resolution: | time-averaged |
Collection methods and comments
| Collection methods: | field collection | ||
| Reason for describing collection: | taxonomic analysis | ||
| Collectors: | C.-S. Yun, K. Tanabe | Collection dates: | 1997 |
| Collection method comments: KPE = Department of Earth Science, Teachers College, Kyungpook National University, Taegu, South Korea | |||
Metadata
| Also known as: | Makkol, Sangdong; Taebaeksan Basin | ||
| Database number: | 89523 | ||
| Authorizer: | B. Kröger | Enterer: | T. Liebrecht |
| Modifier: | T. Liebrecht | Research group: | marine invertebrate |
| Created: | 2009-05-28 17:50:46 | Last modified: | 2009-05-28 20:54:26 |
| Access level: | the public | Released: | 2009-05-28 17:50:46 |
| Creative Commons license: | CC BY | ||
Reference information
Primary reference:
| 30016. | C.-S. Yun. 1999. Three Ordovician cephalopods from the Jigunsan Formation of Korea. Paleontological Research 3(2):65-80 [B. Kröger/T. Liebrecht] |